Design 47: the build seats yield under one share per node (ADR 0553)

03-DESIGN/01-to-be/47-delivery-from-commit-to-delivered.md

@@ -4,6 +4,7 @@ status: in-progress
 code: [mesh-controller, mesh-catalog modules/mesh-delivery-gate, mesh-delivery, mesh-host, mesh-sdk, mesh-vault, hq 00-META/checks]
 updated: 2026-10-26
 decisions:
+  - "ADR 0553"
   - "ADR 0551"
   - "ADR 0550"
   - "ADR 0549"
@@ -138,6 +139,10 @@ source revision is derived from the keys: every **want** equals its module's **f
   **build capacity**, a setting of the node that the build modules read; a node at capacity 0, the control-node among them, pulls nothing
   (ADR 0525 §2, §4, §5). One ask is one whole job on one node: the fetch, the build and the push of a fingerprint, or the fetch, the digest and
   the levels of a check (ADR 0525 §3). A session may call a build module's tools on a named node (ADR 0525 §8).
+  **The build seats yield** (ADR 0553): the node-engine places every build module's runtime of a node in one slice at the top
+  of the hierarchy, at idle CPU weight and nice 19, under one quota of the node's share of its processors (the tool runner's
+  setting `build-cpu-share`, default half, set per node), and each step runs its part of that share in threads. Interactive and
+  service work always come first, and all build modules of a node share one bound.
 - **The checker** runs the merge check on built artifacts: a change's tests, through the build module of each
   module's language and by that language's convention, running only the packages whose inputs changed and
   taking the kept verdict of the rest; it writes the change's one status (ADR 0444, ADR 0445, ADR 0447); it runs dark in R4c-5 (ADR 0484).